URL الوصول: https://explore.openaire.eu/search/publication?articleId=od______1326::c8b73614af4f79f94cde47f481e1f868https://repositorio.unal.edu.co/
URL الوصول: https://explore.openaire.eu/search/publication?articleId=od________25::e8947030031c29e50cb00a16b5087c0ahttps://hdl.handle.net/10614/11445
نوع المادة: eBook.